Benchmark 2

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G-RSM benchmark test Part 2


4. GSM MPI Wall Clock Time Comparison on COMPAS Linux cluster (SIO) - older processors.


Wall clock time required to run 24 hour forecasts (Global model with 28 levels in the vertical)

200 km resolution
 Speed-up
 1/(NPE ratio)
T62L28 16PEs
 80sec
 0.45
 0.27
T62L28 32PEs
 49sec
 0.73
 0.53
T62L28 60PEs
 36sec
 1
 1
T62L28 120PEs
 40sec
 1.06
 0.5
 slowed down!
T62L28 186PEs
 44sec
 1.26
 0.32
 slowed down!
T62L28 252PEs
 47sec
 1.34
 0.24
 slowed down!

100km resolution



T126L28 60PEs
 218sec (3min 38sec)
 1
 1
T126L28 120PEs
 128sec (2min 08sec)
 0.59
 0.5
 very good
T126L28 186PEs
 116sec (1min 56sec)
 0.53
 0.32
 poor
T126L28 252PEs
 140sec (2min 20sec)
 0.64
 0.24
 slowed down!

50km resolution



T248L28 60PEs



T248L28 120PEs
 2100sec (35min 00sec)
 1
 1
T248L28 186PEs
 1515sec (25min 15sec)
 0.72
 0.65
 very good
T248L28 252PEs
 970sec (16min 10sec)
 0.46
 0.48
 excellent

25km resolution (obtained from running 6-hour forecasts)

T496L28 60PEs



T496L28 120PEs
 28624sec (7hours 57min 04sec)
 1
 1
T496L28 186PEs
 17272sec (4hours 47min 52sec)
 0.6
 0.65
 excellent
T496L28 252PEs
 13188sec (3hours 39min 48sec)
 0.46
 0.48
 excellent